External Interrupts using STM32

#ViduraEmbedded #STM32 #STM32CubeIDE
This tutorial explain step by step overview of External Interrupts with STM32 based boards [Nucleo & Discovery ] using STM32CubeIDE.
Code:
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[@balafarms8245]

Super you teaching is easy to understand the concepts for freshers I hope do you more to everyone.

[@ltlt6117]

Hi how much is the time between interrupt(falling or rising edge) and function in normal case and how we can decrease this time ? (Doing the function immediately after interrupt without any delay)

[@programming40guru]

make a full playlst as well as sun possible

[@pattisimus5944]

I tried this with a outside pin I added ( PA6 ) But I had some troubles with it thou, when i pressed the button nothing happened The problem could be that it should be PULLUP or NOPULL pin Or myb I missed something other but idk what (STM32Nucleo FF46RE)

[@viduraembedded6369]

Check the interrupt priorities

[@Red_Fang.]

how to make long pressed push button ? thank you

[@tajmul1692]

Why do we need to change preemption priority to 1? Thanks

[@viduraembedded6369]

Hi Tajmul, Good question. ARM Cortex microcontrollers has a 24 bit in built timer. This timer also called SysTick timer. HAL_Delay() function provided by ST will use the SysTick timer to provide delay in ms. SysTick timer interrupt is configured to priority 0 by default. In ARM Cortex lower the numerical value higher the priority of the interrupt. Hence, I used priority 1 which is slightly higher the numerical value but lower the priority than SysTick. If you configure both SysTick and input to priority 0 then uc won't be able to process you external interrupt and code will hang at SysTick ISR. Hope this clarifies your question. Thanks, Vidura Embedded

[@Alan96555]

@@viduraembedded6369 Hi, im using the stm32f303re nucleo board and i cant change the preemption priority, i can only change the sub priority

[@TebogoSechelentebo]

@@Alan96555 did u get answer here